$\frac{4x^{2}-36}{2x-5}$
$\int2x\left(x^2+\right)^{-15}dx$
$2\sin^2x+2=7\cos x$
$\lim_{x\to\infty}\left(\ln\left(x\right)-\ln\left(x+1\right)\right)$
$9x^2+2\:para\:x\:=5$
$\left(\frac{1}{2}n\right)^2$
$36x^2-40x+13$
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